Mold and method for forming the bell of a bell-ended pipe



y 1953 H. F. KENNISON 2,644,218

MOLD AND METHOD FOR FORMING THE BELL OF ABEL-ENDED PIPE Filed-Aug. 19, 1948 :s Sheets-Sheet 1 irra/iwfy H. F. KENNISON 2,644,218

3 Sheets-Sheet 2 MOLD AND METHOD FOR FORMING THE BELL OF A BELL-ENDED PIPE 22 Z5 Z5 51 a0 55 INVENTIOR. i/qg'lt fi'ffmmson BY HTTOR'NE) July 7, 1953 Filed Aug. 19, 1948 INVENTOR. flqg I'Imazsmv TTORNEY 3 Sheets-Sheet 3 H. F. KENNISON July 7, 1953 MOLD AND- METHOD FOR FORMING THE BELL OF A BELL-ENDED PIPE Filed Aug. 19, 1948 Patented July 7, 1953 UNITED STATES PATENT OFFICE I MOLD AND METHOD FOR FORMING THE BELL OF A BELL-ENDED PIPE Hugh F. Kennison, Verona, N. J assignorto Lock Joint Pipe Company, East Orange, N. J a corporation of New Jersey Application August 19, 1948, Serial No. 45,078

' 4 Claims.

This invention relates to a mould and a method for making a pipe of the bell and spigot type. An object of the invention is to provide an apparatus and method for applying and finishing a bell for making a concretepipe with a bellend and in which a prefabricated concrete collar is secured to a prefabricated concrete conduit in such a manner that the interior of the bell can beprovided with a smooth surface of desired dimensions. during the process of securing the collar and the conduit together. n

Another object of the inventionis toprovide a mould ring adapted to be disposed at the end of a conduit and in extension thereofland to be used in conjunction with'the conduit and a collar to be securedto the conduit as a mould which maybe filled with cementitious material Whereby the collar is secured to theiconduit and the interior of the bell is finished to the precise dimensions desired, The mould ring is so constructed as. to be readily removable from the in-- terior of the bell hardened.

It is desirable that the interior surface of the bell of a concrete pipe be smooth, particularly when it forms part, of the joint which'is sealed when a spigot on which a gasket is mounted is engaged with the bell This is because a rough surface on the bell will abrade the gasket and in some cases may prevent the closing of the joint. Moulding processes commonly employed cannot be depended upon to provide concrete surfaces for the interior of a bell which are sufficiently smooth and accurate to effect an effi cient seal and to assure uniform sealing conditions for all of the joints in a pipe line, and it is therefore an object to improve bell and spigot'joints for con.

crete pipes.

Other objects and advantages of the present invention will be hereinafter set forth in the accompanying specification and claims and demonstrated by the drawings which show'by way of illustrationa preferred embodiment of the principle of the invention and the best modewhich has been contemplated for applying that prinwhen the filling. material has surfaces of the concrete conduit and mould ring Fig. 4 is a section on line 4--4 of Fig. 3;

Fig. 5 illustrates the manner in which the pipe and the mould ring are removed from the base -mould'ring is contracted to remove it from'engaging relationship with the interior of the bell; and

Fig. 8 is a detail of the mould ring showing a re movable segment and adjacent ends of the mould ring.

The conduit portion ofthe pipe and the collar which is to constitute the main portion of the bell end of. a pipe are separately fabricated and they may each be moulded or cast in any well-known manner, such as by the use of stationary or centrifuging moulds. These members may be made of concrete or of other mouldable material which is serviceable for use as conduits upon hardening, and they may be provided with or without steel reinforcing. An advantage of making concrete 1 hereinbelow. The other end of the conduit may be finished in like manner, if desired, or may be left plain, as illustrated in Fig. l, or may have a.

gasket-receiving groove 4 formed therein, as illustrated in Fig. 2. V

A form of pipe which may be made in accordance with the principles of the present invention is illustrated in Fig. 2. This pipe includes a prefabricated conduit I, a prefabricated collar 5 and,

filling material 6.- which, together with the collar 5, forms the bell of the pipe and secures the collar 5 to the conduit 1.

As illustrated in Figs. '3, 4 and 5, a mould by which the bell may be formed, includes a base I in the form of a plate and to which is attached a pipe-supporting ring 8 or other supporting elements which may constitute a number of posts circumferentially spaced below the conduit. The ring ,8 or other supports may be secured to the plate I in any manner desired. A

an interior of a porseries of bolts 9 may be spaced in a flange at the interior of the supporting ring.

The support or ring 8 is provided with a radial surface and a conical surface H by which the end of the conduit l is supported and centralized with respect to the axis of the ring. The conical surface has a slope corresponding with the slope of the surface 3 at the end of the conduit. If the end of a conduit is plain, that is, has its entire end surface in a plane normal to the axis of the conduit, as illustrated at the right-hand end of Fig. 1, the conduit supporting surface If! would be horizontal throughout, and guiding means fastenedt the interior of the support 8 and extending into contact with the inner surface of the conduit would to the support. The height of the'extreme end of the conduit from the base I is determined by the length of the bell desired. The support 8. isv provided witha cylindrical surface 12 which contactsfwith and holds the mould ring 13 i concentric relationship with the wall of the conduit. The plate 1, support 8 and mould ring 53 are preferably made of steel.

The. outside. surface M of, the mould ring I3 is highly polishedand. is. finishedto. a true cylindrical. surface to. form. the interior bearing surface. I5 of the bell and may be provided with an outwardly sloping surface 15 if a flare is desired at the mouth I! of the bell. As illustrated in.Fig. 3, the diameter of the outer cylindrical surface Id of the mould ring 13 is substantially the same as the outer diameter of the conduit I, but. it will. be understood that it is important that thediameter of. .the surface Ill be such as to form a. bearing surface. [5. at the interior of the bellwhichwill complement. and telescopingly engage with the bearing surface ,of the spigot with which it is to be joined, whatever itsdiameter may be. In the present case the spigot has anexterior bearing surface 18.. of substantially the same diameter as the exterior of the conduit.

. The prefabricated concrete collar 5 constitutes a part. of the mould and it is placed exteriorly.

material 6 which is tamped into place between the'ring l3 and the collar 5, and the collar is attached to the conduit by continuing the placing and tamping of the material until the space between the collar and the conduit is filled. The filling material may constitute any of the commercially used jointing materials which are suitable for producing a smooth surface when placed against a polished form and which becomes strong enough for caulking upon hardening.

Mortar comprising dry cement'and sand slightly moistened. with water and tamped' into place has been found to be suitable.

The exterior surfaces l4 and I6 of the mould ring 13 are ground smooth to true cylindrical and sloping surfaces, respectively. A removable segment 22, as best seen in Figs. 4, 6 and 8, is

end of thebar 23;

4 provided to facilitate the removal of the mould ring l3 from the bell after the filling material has set. The ring has been finished to its correct dimensions. A removable segment 22 is cut from the ring preferably after bar 23 carrying bosses 28 and 3| is attached to the segment by such means as: screws 24, 25, etc. The bores of the bosses 26, 2'! of. theering" and the bore of boss 28 are drilled in alignment, and the bores of the bosses 29, 30 are drilled in alignment with the bore of the boss 3| at the other By following this procedure and severing the removable segment 22 from the mould ring after the mould ring has been finished, the shape of the mould ring when the segment is in place will be assured. The segment 22 is maintained in place as a part of the mould ring by the pins 32 and 33, Fig. 6. When the mould ring is assembled with the removable segment 22 in position, the exterior surfaces of themould ring define true. surfaces of revolution.

After thefillingmaterial 6 has. hardened the pipe is removedfromthe base of the mould either by lifting. the pipe from the base, .as illustrated; in. Fig. 5, or by knocking the base away from. the pipe. Inview of the compactness of the filling material produced by'tamping, the removable mould ring will'adhereto the. filling. ma..- terialandbecome detached from the base when the pipe is separated from .the..base; This ,relationship of the mould ring andthe. pipeis illustrated in Figs. 5, 6 and17.

The mould ring may easily be. detached from.

the interior of. the bell after pins. 32- and 33' have beenwithdrawn and the. segment 22. is re.- leased. from the remaining portion of. the ring.

The pins 32 and. 33. are ,thenused to engage the links 35.. and. 36 of. a tool. 3.1, Fig. '7', by which the remaining portion of the ring is relieved is left smooth. andtrueas mouldedby the mould.

ring, andv nofurther finishing is necessary tocomplete the pipe. Whenthe filling material hascompletely cured, the pipeis serviceable and ready for. use.

Aconcrete; pipe manufactured in. the manner, described has. the advantage of having astrong,

bellowing to theintegrality of the collar Ill-and the monolithic, layer of dense filling material; of substantial thickness which is bonded to' the collar'andthe conduit and provides an ideal in-' terior bearing surface for thebell. The interior bearing surface l5=is smooth andhas precisely the dimensions desired. sealing gasket is composed of'a relatively-noncompressible material, such. as' rubber, the space' I for enclosing the gasket within a closed joint must be accurately determined within close tolerances. If the space confining" a gasket of a given volume is too large, an adequate pressure-- proof seal cannot beattained, and if the space is too small, either the joint cannot be closed,. or a great deal of force'must be exerted on the pipes in order to couplethem together. Thepolishedexterior surface ofi'th'e: mould' ring 14. asisures. accuracy and. produces. a; smooth. interior;

Especially when the' 5 for the bell which minimizes the possibility of abrading or otherwise injuring the gasket when pipes are coupled.

What is claimed is:

1. A mold for attaching a collar to a conduit and for forming the interior of a bell at the end of the conduit, comprising a base, a mold ring for forming the interior of a bell, means carried by said base for supporting a conduit from one end and for holding said mold ring in concentric relationship with respect to said conduit and with the mold ring disposed adjacent the end of the conduit, means for 10- cating a collar concentrically to said conduit and to said mold ring, said collar having an interior surface spaced from the exterior surfaces of said conduit and mold ring for providing an annular recess for receiving filling material.

2. The combination set forth in claim 1 in which the mold ring has at least one section which can be removed from the mold ring in order to detach the mold ring from the filling material after the filling material has hardened.

3. A mold for attaching a collar to a conduit 1 and for forming the interior of a bell at the end of the conduit comprising a base, a mold ring for forming the interior of a bell, said mold ring having a removable segment, means for supporting a conduit from one end in spaced relation to said base, said means being constructed and arranged to maintain said mold ring in concentric relation to said conduit, and means for mounting a collar in spaced relation to said conduit and mold ring for providing an annular space outside of said conduit and mold ring for receiving filling material, whereby said collar is attached to the conduit and the interior of the bell is formed exteriorly of the mold ring.

4. A method for making a pipe of the bell and spigot type having a concrete conduit portion and a bell, comprising the steps of arranging said conduit portion and a concrete collar having an inner diameter greater than the outer diameter of said conduit portion in alignment on a common vertical axis with the collar overlapping and extending beyond the lower end of said conduit portion and retaining such arrangement of the conduit portion and collar by a mould having a smooth cylindrical surface disposed below the'lower end of said conduit portion opposite to and spaced from saidcollar and adapted to form an inner face of desired dimensions for said bell, filling the annular space within said collar with a relatively dry mortar mix, completing the bell by tamping said mix to form a monolithic layer of dense mortar in bonded relation to said collar and conduit portion and to impart to the portion of said layersurrounding the mould the smooth surface ,of said mould, and removing said mould from said pipe after the mortar mixhas hardened.

HUGH F. KENNISON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 22,782 Rembert Aug. 20, 1946 349,265 Williams et a1. Sept. .14, 1886 823,963 McNamire June 19, 1906 942,922 OConnor Dec. 14, 1909 950,578 Schmidt Mar. 1, 1910 1,204,550 Drew Nov. 14, 1916 1,269,164 Davidson June 11,1918 1,783,605 Della Dec. 2, 1930 2,180,695 Rembert Nov. 1, 1939 2,216,896 Trickey -1 Oct. 8, 1940 2,359,755 Fischer Oct. 10, 1944 FOREIGN PATENTS Number Country Date 7 741,838 France Dec. 20, 1932 583,459 Great Britain Dec. 18, 1946 

